staging/lustre/ldlm: In ldlm_pools_fini make sure there was init first.

It turns out if you call ldlm_pools_fini without completing the
ldlm_pools_init, then attempt to unregister not yet registered
shrinkers makes the kernel very unhappy.
So make sure we have them registered first.

Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_pool.c b/drivers/staging/lustre/lustre/ldlm/ldlm_pool.c
index 4519d77..c234acb 100644 (file)
--- a/drivers/staging/lustre/lustre/ldlm/ldlm_pool.c
+++ b/drivers/staging/lustre/lustre/ldlm/ldlm_pool.c
@@ -1486,8 +1486,10 @@ EXPORT_SYMBOL(ldlm_pools_init);
 
 void ldlm_pools_fini(void)
 {
-       unregister_shrinker(&ldlm_pools_srv_shrinker);
-       unregister_shrinker(&ldlm_pools_cli_shrinker);
+       if (ldlm_pools_thread) {
+               unregister_shrinker(&ldlm_pools_srv_shrinker);
+               unregister_shrinker(&ldlm_pools_cli_shrinker);
+       }
        ldlm_pools_thread_stop();
 }
 EXPORT_SYMBOL(ldlm_pools_fini);